diff --git a/python/cpp/Makefile.jinja b/python/cpp/Makefile.jinja
index b515de3..42df121 100644
--- a/python/cpp/Makefile.jinja
+++ b/python/cpp/Makefile.jinja
@@ -66,7 +66,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/cpp/pyproject.toml.jinja b/python/cpp/pyproject.toml.jinja
index 3826a53..9110ffb 100644
--- a/python/cpp/pyproject.toml.jinja
+++ b/python/cpp/pyproject.toml.jinja
@@ -110,7 +110,7 @@ test-requires = ["pytest"]
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/cpp/{{module}}/extension.pyi b/python/cpp/{{module}}/extension.pyi
new file mode 100644
index 0000000..bfb558d
--- /dev/null
+++ b/python/cpp/{{module}}/extension.pyi
@@ -0,0 +1 @@
+def add(i: int, j: int) -> int: ...
diff --git a/python/cppjswasm/Makefile.jinja b/python/cppjswasm/Makefile.jinja
index e243c04..957d88c 100644
--- a/python/cppjswasm/Makefile.jinja
+++ b/python/cppjswasm/Makefile.jinja
@@ -97,7 +97,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/cppjswasm/pyproject.toml.jinja b/python/cppjswasm/pyproject.toml.jinja
index 6425332..3fd6b90 100644
--- a/python/cppjswasm/pyproject.toml.jinja
+++ b/python/cppjswasm/pyproject.toml.jinja
@@ -122,7 +122,7 @@ test-requires = ["pytest"]
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/cppjswasm/{{module}}/extension_cpp.pyi b/python/cppjswasm/{{module}}/extension_cpp.pyi
new file mode 100644
index 0000000..bfb558d
--- /dev/null
+++ b/python/cppjswasm/{{module}}/extension_cpp.pyi
@@ -0,0 +1 @@
+def add(i: int, j: int) -> int: ...
diff --git a/python/cython/Makefile.jinja b/python/cython/Makefile.jinja
index 1842e9e..c1b271a 100644
--- a/python/cython/Makefile.jinja
+++ b/python/cython/Makefile.jinja
@@ -40,7 +40,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check Python types (advisory)
 	ty check {{ module }}
 
-checks: check-dist  ## run distribution checks
+checks: check-dist check-types  ## run distribution checks
 check: checks
 
 test:  ## run Python tests
diff --git a/python/cython/pyproject.toml.jinja b/python/cython/pyproject.toml.jinja
index 9d6043a..8e6ef07 100644
--- a/python/cython/pyproject.toml.jinja
+++ b/python/cython/pyproject.toml.jinja
@@ -87,7 +87,7 @@ replace = 'version = "{new_version}"'
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
     "{{ module }}/_compiled.py",
 ]
 
diff --git a/python/cython/{{module}}/_native.pyi b/python/cython/{{module}}/_native.pyi
new file mode 100644
index 0000000..44df0f3
--- /dev/null
+++ b/python/cython/{{module}}/_native.pyi
@@ -0,0 +1 @@
+def add(left: int, right: int) -> int: ...
diff --git a/python/js/Makefile.jinja b/python/js/Makefile.jinja
index b478d93..0061891 100644
--- a/python/js/Makefile.jinja
+++ b/python/js/Makefile.jinja
@@ -79,7 +79,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/js/pyproject.toml.jinja b/python/js/pyproject.toml.jinja
index c187e98..2dfb440 100644
--- a/python/js/pyproject.toml.jinja
+++ b/python/js/pyproject.toml.jinja
@@ -92,7 +92,7 @@ replace = '"version": "{new_version}"'
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/jupyter/Makefile.jinja b/python/jupyter/Makefile.jinja
index ef081c7..6710fc9 100644
--- a/python/jupyter/Makefile.jinja
+++ b/python/jupyter/Makefile.jinja
@@ -81,7 +81,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/jupyter/pyproject.toml.jinja b/python/jupyter/pyproject.toml.jinja
index 2545f30..98d2f4e 100644
--- a/python/jupyter/pyproject.toml.jinja
+++ b/python/jupyter/pyproject.toml.jinja
@@ -100,7 +100,7 @@ replace = '"version": "{new_version}"'
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/pure/Makefile.jinja b/python/pure/Makefile.jinja
index 1708a80..8840883 100644
--- a/python/pure/Makefile.jinja
+++ b/python/pure/Makefile.jinja
@@ -52,7 +52,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # Alias
 check: checks
diff --git a/python/pure/pyproject.toml.jinja b/python/pure/pyproject.toml.jinja
index 9c992d5..83d5f95 100644
--- a/python/pure/pyproject.toml.jinja
+++ b/python/pure/pyproject.toml.jinja
@@ -81,7 +81,7 @@ replace = 'version = "{new_version}"'
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/rust/Makefile.jinja b/python/rust/Makefile.jinja
index c791320..addd238 100644
--- a/python/rust/Makefile.jinja
+++ b/python/rust/Makefile.jinja
@@ -80,7 +80,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/rust/pyproject.toml.jinja b/python/rust/pyproject.toml.jinja
index 5a83144..a898e12 100644
--- a/python/rust/pyproject.toml.jinja
+++ b/python/rust/pyproject.toml.jinja
@@ -131,7 +131,7 @@ xbuild-tools = ["cargo", "rustc", "rustup"]
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]
diff --git a/python/rustjswasm/Makefile.jinja b/python/rustjswasm/Makefile.jinja
index 88d51f3..11dd019 100644
--- a/python/rustjswasm/Makefile.jinja
+++ b/python/rustjswasm/Makefile.jinja
@@ -94,7 +94,7 @@ check-dist:  ## check python sdist and wheel with check-dist
 check-types:  ## check python types with ty
 	ty check --python $$(which python)
 
-checks: check-dist
+checks: check-dist check-types
 
 # alias
 check: checks
diff --git a/python/rustjswasm/pyproject.toml.jinja b/python/rustjswasm/pyproject.toml.jinja
index 5413f5f..a600bc1 100644
--- a/python/rustjswasm/pyproject.toml.jinja
+++ b/python/rustjswasm/pyproject.toml.jinja
@@ -143,7 +143,7 @@ xbuild-tools = ["cargo", "rustc", "rustup"]
 [tool.coverage.run]
 branch = true
 omit = [
-    "{{ module }}/tests/integration/",
+    "{{ module }}/tests/integration/*",
 ]
 
 [tool.coverage.report]